Misspellings of omitempty

[bvwells]

It would be great if misspell could catch misspellings of omitempty. Recently I have seen these misspellings:

ompitempty
omitemtpy

For example:
https://github.com/openshift/installer/pull/4166/files
cloudflare/cloudflare-go#531
cloudflare/gokeyless#279
sky-uk/skyinfoblox#74
openshift/machine-config-operator#2104
hashicorp/go-oracle-terraform#188

A search on github.com for 'omitemtpy' results in over 50 pages of results! Mainly due to a typo in kubernetes code which got duplicated around the world!

More than happy to add a PR, but wasn't sure of the process as words.go says that it is auto-generated.